| 摘要 |
The invention relates to a method for producing polyether polyols by reacting diols or polyols with ethylene oxide, propylene oxide, butylene oxide or mixtures thereof in the presence of a multimetal cyanide complex catalyst. The reaction is carried out in a vertical, high cylindrical reactor comprising a discharge nozzle which is situated in the upper reactor area and directed downwards, and by which means the educts and the reaction mixture are supplied; and an outlet which is preferably situated in the lower reactor area and through which the reaction mixture is guided back to the discharging nozzle by means of a pump and via an equalising reservoir, in an outlet circuit. The reactor also comprises a concentric guiding pipe which extends over the entire length of the reactor with the exception of the reactor ends, and a heat exchanger which is integrated into the annulus. |
